Just be sure she's completely comfortable with whatever carrier she picks. Getting one that works is kind of like asking someone their favorite toothbrush. I found a ring sling best for flying. Less comfortable than a wrap but easier to learn and easy to get on and off. But many fly with a wrap just fine.

She can visit http://peppermint.com (I like this link since there are products from many sources) or if she's already involved in her La Leche group, they might be able to help... Some carriers come with videos and there are many baby-wearing sites.

It's good that you're going over with her. She'll have experience for the way back. If the cot doesn't work out, than you take it back (one less thing for her to lug around). It's not a "mess". It's a little uncomfortable, long and not something you want to do every day but she'll survive. She needs to stay well-hydrated if breastfeeding (recommended for many reasons, including easier travel). My worst flights were with toddlers, not newborns!